
Example for Increasing Measurement Resolution at
Specific Frequencies
The FFT Segment Table shown below is configured to cause the HP 3048A
to measure and plot the phase noise of a signal at specific offsets from the
carrier frequency. This technique will generally give better resolution for
each unique point analyzed, but the measurement may take longer due
to the smaller bandwidth at each offset frequency. The segments can be
either continuous, or separated into isolated segments.
Plotted
Range
500E-3
5
50
500
5E+3
90E+3
(Hz)
1.5
15
150
1.5E+3
15E+3
100E+3
Measurement
Range
500E-3
5
50
500
5E+3
90E+3
(Hz)
1.5
15
150
1.5E3
15E+3
100E+3
Min.
Av'g
1
1
5
20
100
100
BW (Hz)
.010
.095
.955
9.548
95.485
95.485
Time Record
Length (Seconds)
400.000
40.000
4.000
.400
.040
.040
NOTE
The maximum number of Measurement Ranges that can be
defined for the FFT Segment Table is 20.
The maximum offset frequency that can be specified in the
FFT Table is 100 kHz.
5-22 FFT Segmnts
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